Well if it was me I'd go for the new Pre-drilled tank. A lot cleaner set up IMO. No overflow box to worry about and you could even up the gpm on the pump. Just use the one you ordered for back up. I have a smaller one just in case the main malfunctions. My LFS just got a used 54 in again, but the glass is scratched up. I got mine used for $300 with stand, pump and sump, but I had the custom sump built for it. I definitely prefer new stuff, lol used makes me nervous ( fingers crossed)